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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bd339df3cb2b59e20ce535853538794e0ca0043f13ec1666ca08742a0d8cbff' 
  AND token = 'WXIZajCqZZ67PWQhvy62NZ5Vkjnu50V6jroovguvloQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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