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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd4aedfcc0806333bb51a2452b1360136bfe0fec1daa0e577e5867edca7d3f18' 
  AND token = '/QQgmf6DBzShQBKuxGM03Vv2eo2i8l6xNxtV9cXIG6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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