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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6d3a8802109acacf1f55cc6f4452943d7ce8a5d9d36dfaee7d4f2ecbf23b7cd' 
  AND token = 'o/MSk+bphZszQv0V7Q8zhrICfAsqfdPVQDa0RkGek5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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