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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d8fc1876fa7a5c7ea9ff10f4660e13bcad9b234bf02bd4b44d6301f114679f3' 
  AND token = 'SCSqa4YnXONkQTValSQ8zkZ2/b5OJIiX2BsfoGEqpoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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