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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b91993aec82413e3a3cb662cdf42943ed6e651497587709626a5f46ce8efbc6e' 
  AND token = '6Cjw04JaaAIEPSlD59zvzgcEwzzMSkPdx5kDu3+h4fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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