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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcdb0676a671661f50b163c3e2034f9b7a434f6394376afa78fbd276a2fbe69f' 
  AND token = 'iRc1acJQDc6GOX0vdvEVtItuXQ5Oq977WrZuH/xP/Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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