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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '784c5b0a2f00ac662c3881ab49785d3c510c4f46ebab09e7e07ecf1f94c7905b' 
  AND token = 'J505lAWhHzag1y7vCEA0gceAoKx76nl8lJXSrniUZIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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