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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd218d8e485edb3bd618b9e544f4509f6f912b0b89a4ccc89dfe4059fdc3ac5b' 
  AND token = 'oWxT5XYfkhggepUaar+N4e2Gc20oL3gR5PJSGO/OJu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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