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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a477949347544adb63c341ec408ba39d3368af0cae718b26a88f4d60009e0cf' 
  AND token = 'u5/r9fnjiL7uRDq5cb/H3C6NrkKwfz9AzAHWAnVzCGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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