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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd475c1e668931bd3fd0ae7a67a6fb101021e63b3a1afc1bb887d028877d76eca' 
  AND token = 'Z+m1ssfwLrG97Owpv0PjjecBmeFqKOcJquWJ+8+69xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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