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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8d50e92ba299553155938b8eb5b91a79b77c46af2f6dc1b320489f190c42eda' 
  AND token = 'UCVhqPMSyQEpTNn2C4twUdkrqax7nzEN+ebw5Qd1TVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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