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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7d91aa36d63ce41c2778b559b887a37999a25004ecd50f8a1211cb356d2e2f8' 
  AND token = 'qplX+R1Xs7fhHynoXGlj0I6hjnTCFteNhNNVFW/FXOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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