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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08d1e6b2ff8108a21d77e9bc688625b12e249b584b454f3bccee4351fabf3940' 
  AND token = 'gECWKS+ZycTQLZIYvAnQP0tyMkhyyb/kTEprRda8ans=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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