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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0a0120fe5d919b3ad1b6a3e89fef4c9d2df9d776889a8c96336220e3b3a9419' 
  AND token = '++TL/yAac7ZWfCm1XxZesbXeTcg5XFEzPMrew+wNZo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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