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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a964a71fde8825d9951b6d8ca506e1f1de0d5e3a53f15104fe2c1aa1c77a5d9c' 
  AND token = 'HyQYW2qnOtxPhJH0cEr1qmnVyOjsnfPMZ1Up16+aPTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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