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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6d6e45539c7b4cfff77e28d68173414d3498bf523cdc580e572043f03e1da3e' 
  AND token = 'y4A+rt/pQ3xOPRkfyGkDMaZ24WNz9AHV9uf5NvOORlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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