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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82d064e3c333b7da403b014ada0b9c700aec3f187fcb95dfdb02f65d880ef547' 
  AND token = 'RU0CiIfgppysapND6J09D/QPoYhm5X+qoE+ClR4PqL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}