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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29fb6740b0b08adf3d75b449afcee57c3e2607e82858ea9c1162a6494c417cf1' 
  AND token = '7z6Q4jr6gBox0xYS8WMU7M83uGaKFeH8FqXSXIcYwAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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