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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c47a210639444bc1319d35d1f5aca66b45ec3ffb4f189e4842c75c918b0a3f7b' 
  AND token = 'OVHkYyCmV3NEufcoY8ImvNLpNKfa/dMa0YsAxPLFtkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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