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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6731ae60da14c477434a47a0aa85eebf04a25ed031ad6bd5160b2caba16fdc5' 
  AND token = 'CaT1vO7m9LzuyAPXZjgamB9QTXuT6lmHkR+9/pNCogM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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