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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbe0a46b841a912e61da79c11ea104382c9c0e733828ea3744636d8f3097158a' 
  AND token = 'T2RmXo8HrJy/1cJREsAkZUTl0pUg/rGcwX3sIx+kzXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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