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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac7eeafe8a0c7d5ee55cb4d1cc5be9f985b0a701026df3f062a0ef3feb7bc03' 
  AND token = 'fQdjVWFA9vencXUykVE9f4LACDIXpdpI5VLQqxleQ4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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