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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee788670a7aa4bc65123c151796a5460a7fcc6ce4aa82f07a1dd55bb880614a3' 
  AND token = '1/hy06/1tx32MUVeN5SlbpXbcqfLo89L/YCpUwGag5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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