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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb06a7e07c511c6df1f7322e1480fda87b7b1bd8fab7ab9e7880eb2b28f5bd60' 
  AND token = 'HPOh1Glw4Z0P8lw3XOcb1MxYkgT1Ui9+HmPqYBAQCr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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