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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56a7fb8cf620b1e7af0ce5b00961356d22a5e373f72ad43012145ea1850ac2b6' 
  AND token = 'iZxAQXz43V1z3TKdKK3/T4k9o0ih3IUtcH+9IaGrHe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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