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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07bd637179245c408253a238a4bdfd845fa53e67488033252efd8ece4daeb3d6' 
  AND token = '/xQIytNgdidAaMT50eFwNUgMr4Hoe3gSBk9NtRjX7X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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