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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e64e76677d0ac8841b311943c9c5f2ff63f9528771ffc1eaade219f89fb9a0b2' 
  AND token = 'mEkeFN4SVeDW0Kyg/9xueP6ZVnzEMagrbor4OrPqKr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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