SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8112692105f84c22ca9228575576def4dc16e50c8458586c3be4dffa9377bcd' 
  AND token = 'QR1Sy8Q3SXOmGV+o30I+w63h9aBCSiC1FNjJYAUPZWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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