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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2455d028c09fe3b0897e2cad8da6b911ce8c63b42cbc5d8d0edc1fa7721aa58' 
  AND token = '663zPa6WrpOzJQJDwcFG83xgZv/d/dHlTC8DK0PcSj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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