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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57e89b919d28b293edfdde88c9a1f4922b7fdcd8c6cd8c9ef684f0a390f03d11' 
  AND token = 'TH32Gze95oZfW0f1Sdf2+6h6xi+Vdf2FPZH0peWCmQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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