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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '258c3aa2dcd79584c87cddfb54df44d9604439cdadcbf4cbc645b8d569bfecdb' 
  AND token = 'o4e9/DFwSEawjrmeqehe/epnkHvUjKhIX2dd/bqaQJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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