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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3fa43a46d76508b1c73e5bb401d95bd2a24f25eed7f31f1bce7e69fc9391130' 
  AND token = 'Tww44pSDzCmWzUDNE3nKOdyWAvSW4BCjkpSITu9nVHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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