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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f52090c60e035cbe3e142e06f093653a889fddbaccf35483477b375482d4c97d' 
  AND token = 'yBkGT7k1umEM+U9zftYZpyYgETC9ZVlgIsA0nypZ9C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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