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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dab6c0212ee8057b9ba3956173029847ba70e4c669da222778954fb779b9f47b' 
  AND token = 'xJooJJoHI55/Y5CtIIWg2ogJ42edkWpDEo6ehycYidU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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