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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '978a6f759d52c2a3bcaf08a282fa787a9f10d4d183c3f356f2a3aededfa91026' 
  AND token = 'EyFPhFkcZcxMgOth+vyfjRSFaFmhEpkTv1SZenTBbkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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