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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2ae0f34afabf573d19c6e786541790b4fb5b1f364761cb42c6b59fc1af6e6a' 
  AND token = 'aX9MzDydeg5jIzk47seQgvAt7sSMMxZyQy8CeIbuquo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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