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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d7b8a5f117734c9c86306a1c9e904cb28f6399a7c9635b00194f760569fa52c' 
  AND token = 'DsD02I3HMywEyrsUGnJ4/5sRKG62pxnFcRegGliTuck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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