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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98297e22781e6dfb081f274a77d8fdc5bba1a12f5c9253c5d4d8537f9eb6beb0' 
  AND token = 'z60R8dXddAKisZ2usFCt3McmaYLvkKGtI3+yFFuyDj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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