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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87a60c7489864adad4be54686233cd346179bea5a326f7f26e80dbef5fa6530f' 
  AND token = 'vIaKfzpiwaK0VfLL5q5Ul6BcAt2N/kp8ZaxhQ5H4Tog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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