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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23498e9e3651361212496803512c00e94e3728a64627dae5471ab5fe3309475a' 
  AND token = 'EZI1w8v6/wucLp5h2KpHIAZpT/eRH+dXOAHTd+WAPuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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