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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f60b3f4a0ff2922f5ad66e93ac6b88d65692893801372de7d832e1f1e9fc490f' 
  AND token = '3PND+acHdL0105o0JnHh6+O9AZJdaDLrEXmz8rsQAsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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