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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f917e95bd5d39dc690d7d1396d12f10ec83f5b1a9beecbcd08e3af7dcae3d792' 
  AND token = 'x+s92+BUFM4inv/BKrqdcOAzXPAX/rmUuym/cOY/LLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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