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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffbbc52eb235ed1dc1bf4f172d2e2cf038347cd350fa00bf577bccb43f3f438f' 
  AND token = 'E9sPaR47afNCodOAm3IZxhOYJfTNuzYtTQp1BgbfnWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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