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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2a0988fec55f58efd244ac58c06e2bb1431c08ae417463fa60d2c7a7b134dfc' 
  AND token = 'r65fmKGEUk9kPWB/RC4EeRZZanB4Wy5KUlcalEx3pRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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