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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a38f165e0b8a0eac6dbd61dc32d1f3f15264d8429cbefda671d673ae1188871' 
  AND token = 'rIRHASMW/DW3f1j316/7p7CteuJ7XxgMKYLUD3xj8Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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