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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a13fe194e11c0ac6c1964e74c48aae7e46eb7b1ac7bf73f217eb021046b41654' 
  AND token = 'Iwy9MFZwR29IscR7Ijcx8iQpNedgHVOHV8GxWtsYpNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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