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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6363ac8433977eb1189f3acad17a8183c488e02a98fce33b0a024aabd07df43b' 
  AND token = 'hiv40qJ+8wRxTGDHbLtbs+9jrkErPgWFmS3+4mzui1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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