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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e4f225a7e281eea4d42811b835c35b45e987b48bdf325cb17500196e32b75a6' 
  AND token = 'POUXCYLgT3ZR54cvhwZ/54ZaDJktoX7iwUnwhic5wIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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