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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48c3680e7f3cb8dfbfc894b33911f7b6348cc8a480773030290cd622c0002471' 
  AND token = 'uCFWe433i5x+MtWGBh2TysIRQkosR+gt2YaE6UuyOBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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