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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8caa929c36e78437b22931c1e106fabc853e3bb1cd9f512bd7aebf41e9f1cb1' 
  AND token = 'J3thktKsFANPZ+glEPtbybiCUbINM4Zy8NrMY04tA/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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