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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '473d77e7f77d80a056291b94aeb538f184bf808308e566029d0f760656ce73a6' 
  AND token = 'bN7DTcj7YWeFx9dJG/yYBTH2SbccecamtXds/2T7RRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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