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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27aea6fe5f21aa39b1d01cc452687dc85abf7e5a477426752b218aee182bd0e4' 
  AND token = 'kmKTwBowtlRhxpmFo2PFghBw7ufs1pfv77mi0AjprZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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