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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9a589f78e2ec55bd59ab53fa89a017d6c4045d3900dc862bae5da962ad5e2c0' 
  AND token = 'E9y5LNpvIvUZuRhYoArokAnd0jt2cefDrIgFxCwIxXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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