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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fa0c5ea80cf191cd93ed06c894e24e4486d5b29a2d66a38d9d408e7f02b02ea' 
  AND token = '5EIzojA7gqWZwJqxqTglGmC23ac9CZS7xQSWRgxZyOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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