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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e411fc59a8054f465785d37b25e58f4a8a421b27da1e8a296797b8e2b8fde68c' 
  AND token = 'C1bVdpMhdwIuzxN7e0K8Qr2vf8wccoqdmmup0gGk9NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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